Android DownloadManager “Impossible to open file”

Question

I\'m using DownloadManager to download a file from a webService. The download end successfuly, but when I try to open the new file in the \"download\" folder I\'ve got this erro

Answer 1

Yes you have to specify the MIME type. Adding a few more details to the accepted answer.

public DownloadManager.Request setMimeType (String mimeType);

To get MIME type you can use the following function.

private String getMimeFromFileName(String fileName) {
    MimeTypeMap map = MimeTypeMap.getSingleton();
    String ext = MimeTypeMap.getFileExtensionFromUrl(fileName);
    return map.getMimeTypeFromExtension(ext);
}

and the following is the Xamarin.Android implementation of the same :

        private static string GetMimeTypeFromFileName(string fileName)
        {
            var map = MimeTypeMap.Singleton;
            var ext = MimeTypeMap.GetFileExtensionFromUrl(fileName);
            return map.GetMimeTypeFromExtension(ext);
        }

Answer 2

Okay I found the problem !

I had to specify the "MIME content type" of the file using setMimeType().

public DownloadManager.Request setMimeType (String mimeType);